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Segment information (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
Total assets R$ 7,584,481 R$ 7,199,539    
Current assets 1,203,506 1,637,657    
Non-current assets 6,380,975 5,561,882    
Total liabilities and equity 7,584,481 7,199,539    
Current liabilities 1,058,567 905,689    
Non-current liabilities 2,882,902 3,043,692    
Equity 3,643,012 3,250,158 R$ 3,000,018 R$ 2,833,780
Operating segments [member]        
IfrsStatementLineItems [Line Items]        
Total assets 7,584,481 7,199,539    
Current assets 1,203,506 1,637,657    
Non-current assets 6,380,975 5,561,882    
Total liabilities and equity 7,584,481 7,199,539    
Current liabilities 1,058,567 905,689    
Non-current liabilities 2,882,902 3,043,692    
Equity 3,643,012 3,250,158    
Investments in associate 51,834 53,907    
Capital expenditures 218,428 318,155    
Operating segments [member] | Undergrad [member]        
IfrsStatementLineItems [Line Items]        
Total assets 7,104,154 6,775,829    
Current assets 1,001,156 1,461,802    
Non-current assets 6,102,998 5,314,027    
Total liabilities and equity 7,104,154 6,775,829    
Current liabilities 787,658 711,896    
Non-current liabilities 2,783,855 2,938,960    
Equity 3,532,641 3,124,973    
Investments in associate 51,834 53,907    
Capital expenditures 139,361 247,634    
Operating segments [member] | Continuing Education [member]        
IfrsStatementLineItems [Line Items]        
Total assets 180,555 149,254    
Current assets 86,361 61,673    
Non-current assets 94,194 87,581    
Total liabilities and equity 180,555 149,254    
Current liabilities 87,447 57,605    
Non-current liabilities 57,608 63,990    
Equity 35,500 27,659    
Investments in associate    
Capital expenditures 15,178 8,827    
Operating segments [member] | Digital Services [member]        
IfrsStatementLineItems [Line Items]        
Total assets 310,989 275,564    
Current assets 127,206 115,290    
Non-current assets 183,783 160,274    
Total liabilities and equity 310,989 275,564    
Current liabilities 194,679 137,296    
Non-current liabilities 41,439 40,742    
Equity 74,871 97,526    
Investments in associate    
Capital expenditures 63,889 61,694    
Operating segments [member] | Total Reportable Segments [Member]        
IfrsStatementLineItems [Line Items]        
Total assets 7,595,698 7,200,647    
Current assets 1,214,723 1,638,765    
Non-current assets 6,380,975 5,561,882    
Total liabilities and equity 7,595,698 7,200,647    
Current liabilities 1,069,784 906,797    
Non-current liabilities 2,882,902 3,043,692    
Equity 3,643,012 3,250,158    
Investments in associate 51,834 53,907    
Capital expenditures 218,428 318,155    
Operating segments [member] | Adjustments And Eliminations [Member]        
IfrsStatementLineItems [Line Items]        
Total assets (11,217) (1,108)    
Current assets (11,217) (1,108)    
Non-current assets    
Total liabilities and equity (11,217) (1,108)    
Current liabilities (11,217) (1,108)    
Non-current liabilities    
Equity      
Investments in associate    
Capital expenditures